| 摘要 |
PURPOSE: A device and a method for generating an adaptive track zero crossing signal in a disc drive are provided to correct the offset and balance by duty correction for generating a precise track zero crossing signal, thereby precisely carrying out the seek servo control by precise velocity and position information obtained from the track zero crossing signal. CONSTITUTION: A device for generating an adaptive track zero crossing signal in a disc drive includes an analog signal processing circuit(1000) formed of an adder(201), a comparator(202), and a D/A converter(203), and a digital signal processing part(2000) as an offset correcting operation part formed of a counting part(204), an operating part(205), a correcting signal generating part(206), and a noise removing filter(207). The comparator has a first input terminal applied with a reference voltage(Vref), and a second input terminal applied with a tracking error signal(TZCA) added with a correcting signal(U) for correcting offset and balance output from the D/A converter. The comparator compares the signals applied to the first and second input terminals, and generates a high output if the signal applied to the second input terminal is larger than the reference voltage or a low output in the other case, wherein the output signal from the comparator is to be a track zero crossing signal(TZC) of square wave.
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